Your team is not bad but it needs a lot of work to make it to work at its best.
NatDex AG
̶M̶e̶g̶a̶-̶D̶i̶a̶n̶c̶i̶e̶ ---->Mega-Rayquaza
Mega-Rayquaza is one of the best pokemon to use in AG format.And it is thebest to Mega-Evolve on my opinion.
So,the Raysetyou need is
Rayquaza-Mega @ Life Orb
Ability: Delta Stream
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Dragon Ascent
- V-create
- Extreme Speed
- Scale Shot/Dragon Dance.
This is one of the most powerful Ray set I have ever used
Dragon dance to boost your speed and attack and make a sweep or just have Scale Shot to out speed everything.
V-Craete to counter Zac-C,NDM and many steel types and provides great coverage.
Espeed is to kil with priority.
Primal Kyogreis just awesome but at times gets KOed by Zacians Wild Charge and Rays Dragon Ascent
So Scarfed Ogre is really good to outspeed those.
Kyogre @ Choice Scarf/Choice Specs
Ability: Drizzle
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Thunder
- Ice Beam
- Origin Pulse
- Water Spout
This set will be perfect to outspeed almost everything and Water Spout does more damage during full HP.
Ice beam to counter Ray andThunder for Ogre.
But according to me Specswill be great with this set.
Arceus -Ground is really good at setting up Rocks.Your set needs some slight changes.
Arceus-Ground @ Earth Plate
Ability: Multitype
EVs: 252 HP / 4 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Judgment
- Stealth Rock
- Defog
- Recover
You can both setup and remove hazards with this Arceus.This is bulky enoguh to withsatand most of the moves.And with Judgment you ae able to counter Zacian easily or a Zacian transformed Ditto.
B̶l̶i̶s̶s̶e̶y̶----Caly-S
Blissey is an excellent pokemon with the highest HP but stil Your team has enough defensive pokemons and you need some pokemons to deal great Damage
Caly-S will be the best.
Calyrex-Shadow @ Focus Sash
Ability: As One (Spectrier)
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Astral Barrage
- Nasty Plot
- Psyshock
- Draining Kiss
Best Caly set.Send Caly when there is no Rocks or Spikes to make use of Sash.
Psyshock very useful against Eternatus and Bulky Ogre.
Draining Kiss isexcellent Dragon/Dark counter move.
Yveltal .Your Yvelatl set is awesome to play offensive but a defensive Yvelatl is better to have for yourteam.
Yveltal @ Heavy Duty Boots
Ability: Dark Aura
EVs: 252 HP / 16 Atk / 240 SpD
Careful Nature
- Knock Off
- U-turn
- Taunt
- Roost
this Yveltal can resist Astral Barage/Draining Kiss/ Max Starfall from Caly with NO SpA stat rise and KO it easily with Knock Off and also a good counter to Specs/Scarf Ogre to Knock their held item.
̶R̶e̶g̶i̶e̶l̶e̶k̶i̶-----Zac-C
Zac-C is one of the best the pokemon to have in AG.
Zacian-Crowned @ Rusted Sword
Ability: Intrepid Sword
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Wild Charge
- Swords Dance
- Close Combat
- Behemoth Blade
With this set Zac-C gets the most type coverage and can hit any pokemon hard.
Pokespaste
Hope I Helped
Note:Zac-C=Zacian-Crowned and Caly-S=Calyrex Shadow.